Improvement in locks for doors



' E. WIRE.

LOCKS FOR DOORS.

Patented Ju1y.3,1877.

No. 192,724.V

.l Ill l I WNS@ Aonusvs.

N-FETERS. FHOTULJTHOGEAFHER. WASHKNGON. D Cf ELAM WIKE, OF DAYTON, OHIO.

IMPROVEMENT IN LOCKS FOR DOORS.

Specification forming part of Letters Patent No. 192,724, dated July 3, 1877 application ifiled May 28, 1817.

To all whom it may concern:

Be it known that I, ELAM WIRE, of Dayton, in the county of Montgomery and State of Ohio, have invented a new and Improved Door-Dock, of which the following is a specication:

In the accompanying drawing, Figure l represents a side elevation of my improved doorlock, showing it in open position; and Fig. 2 is a side view of the same as closed.

Similar letters of reference indicate corresponding parts.

The invention has reference to an improved burglar-proof door-lock which locks the latch on throwing the key-bolt, and the latch-key and key-bolt on throwing the nightibolt, forming thus a superior safety door-lock that cannot be tampered with from the outside, as the key cannot be pushed in, or a skeleton-key inserted, or any one of the bolts opened.

The invention consists of thecombination of the latch, key-bolt, and night-bolt with a cam-piece and sliding lock-piece, and, finally, of the guard-extension of the night-bolt for locking the key in position.

In the drawing, A represents the latch, whichis opened bythe knob, and thrown again, on the release of the knob, by a spiral spring, in the customary manner. B is the key-bolt, which is operated in the usual manner, but connected by a fulcrumed crank or elbowlever, O, with the latch A, the ends of the elbow-lever bearing against `a curved shoulder, a, of the latch, 'and into a rounded-oft' recess, b, of the key-bolt B, so that when the latter is thrown the latch is rigidly locked and prevented from being drawn back, as shown in Fig. 2. Thus, a twofold locking arrangement is provided by merely throwing the key-bolt.

A night-bolt, D, is arranged below the keybolt, and operated by a pivoted cam-lever, E, that extends to the outside of the lock, and is worked by the fingers along the side of the same. The night-bolt D is connected, by a pivot-link, d, with the cam-lever, and acted upon by aisnapspring, e, when thrown.

' in open The camlever E is` also pivot-link, d', with aA slide-piece, E1, that is guided along suitable rails f, and along the side of lock-case, at right angles to the latch, key-bolt, and night-bolt, and provided with rectangular extensions E2, of which the upper extension passes into a central recess of the latch A, and the lower extension E2 passes above the key-bolt B when the night-bolt is position, said extensions, however, sliding both down on the throwing of the night-bolt behind the solid portion of the latch and behind the key-bolt, so as to lock both thereby, in additionto the lockingI devices already described. The cam-lever and slidepiece form thus a bar to the three bolts, and prevent the withdrawing ot the key-bolt and latch before the night-bolt is withdrawn.

"Ihe rear end oi the night-bolt D is provided with a curved or hook-shaped upward extension, D', that serves to lock the key between the same and the key-bolt when turned Ainto horizontal position, as shown in Fig. 2,

to admit the passage of the extension D below the key when closing thenight-bolt. The key is thereby locked into a ixed position Without the possibility of being removed from the outside, thus preventing the insertion ofanother key. This extension of the night-bolt'forms an additional safeguard to the lock.

The lock has furthermore the advantage that the night'bolt cannot be thrown except when the key-bolt is thrown, Which forms a `very useful feature, as it prevents children from using the night-bolt and locking the door` when the same is not required to be locked.

Thus, Va safety-lock 'ot' simple but effective construction is furnished, which is capable of producing a number .of checks or safeguards by only two motions--namely, by the throwing of the key and of the night-bolt.

Having thus described my invention, I-

claim as new and desire to secureby Letters Patentl l. rI he combination, in a door-lock, of the latch A, key-bolt B, and night-bolt D with the cam-lever E and slidepiece El, having connected, by a l locking-extensions E2, substantially as shown 3; In a door-lock, the night-bolt D, having and specified. curved or hook-shaped rear extension D',

2. The combination in a door-lock, with the t0 secure the key in locked position, as set latch and. key-bolt, of a slide-piece, El, havforth.

ing extensions E2, of which the'lower rests on ELAM WIKE. the key-bolt when the latter is in open posi- Witnesses: tion, to prevent throwing of night-bolt', sub- GEO. M. YOUNG,

stantially as specified. GEO. R. YOUNG. 

